First one to answer correctly,will get 10 points!!
2007-12-21 23:12:56 · 13 answers · asked by fanatic000 4 in Science & Mathematics ➔ Mathematics
simple... use the formula n(n+1)/2
the answer will be 97*(98)/2=4753
2007-12-21 23:18:17 · answer #1 · answered by ranjith kumar shetty 2 · 1⤊ 0⤋
1 + 2 + 3 + 4 + 5 + ...... + 95 + 96 + 97
= (1+97) x 97 / 2
= 98 x 97 / 2
= 9506 / 2
= 4753
2007-12-22 07:51:13 · answer #2 · answered by An ESL Learner 7 · 1⤊ 0⤋
1+2+3+4+5+....+95+96+97
this is an arithmatic series, T1 = 1, common diference d= 1, and the number of terms n= 97
To get this sum use the formula, S = (n/2)( 2t1 + ( n-1)d)
S = 97/2 ( 2*1 + 96 *1)
S = 97/2 ( 98)
S = 4753
2007-12-22 07:20:48 · answer #3 · answered by Anonymous · 1⤊ 0⤋
You asked only till 97 OK?
get started.
n=97
Formula:= n * (n + 1) / 2
= 97 * (97 + 1) / 2
= 97 * 98 / 2
= 97 * 49
=4753
:. The answer is..
1+2+3+4+5+6........+95+96+97 = 4753
....................................
| 4753 is the answer |
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2007-12-22 07:36:55 · answer #4 · answered by Vipul C 3 · 1⤊ 0⤋
1+97=98,
2+96=98,
3+95=98 and so on....
then use (98x48)+49 to find the answer, which is 4753
2007-12-22 07:59:45 · answer #5 · answered by hui yi! :) 2 · 1⤊ 0⤋
1 + 97 = 98
2 + 96 = 98
3 + 95 = 98,
Ca you calculate the answer from the above hint ?
Hope I`ve helped, Twiggy.
2007-12-22 07:17:27 · answer #6 · answered by Twiggy 7 · 2⤊ 0⤋
sum = n(n + 1)/2 ---------- n = 97
= (97 + 98)/2
= 4753
2nd method
sum of 1 to 100 = 5050
so required sum = 5050 – (98 + 99 + 100)
= 5050 – ( 99 Ã 3)---------- (sum = middle No. Ã total No. here middle No. is 99 and total numbers = 3)
= 5050 – 297 = 4753
EDIT
Dear Sahithya
Your formula is correct. But is is useful when the series is not continuous i.e. when series is not from 1 to n
when it is continuous easier is sum = n(n+1)/2
2007-12-22 07:25:03 · answer #7 · answered by Pranil 7 · 1⤊ 0⤋
it's 97*98/2 = 4753
2007-12-22 07:18:58 · answer #8 · answered by mathman 3 · 1⤊ 0⤋
97*98/2=4753
2007-12-22 07:32:42 · answer #9 · answered by Anonymous · 1⤊ 0⤋
hmm, 1+2+3+4+5=12
95+96+97=288
add em' up is 300.
if you want me to find the missing number in the middle then you have to give me the amount of number of the numbers all summed up instead of 300.
oh wait, this could be high school or college math; i have no idea.
2007-12-22 07:24:04 · answer #10 · answered by Anonymous · 0⤊ 2⤋