Find the sum of the 25 natural numbers which is divided by 7
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Answered by
0
Answer:2275
Step-by-step explanation:
Formula for finding sum of numbers in A.P = n/2 [2a +(n-1)d] = Sn
First 25 natural numbers divisible by 7 → 7, 14, 21, .... 175
Here,
a=7
n=25
d=14-7=7
Sn = n/2 [2a +(n-1)d]
=25/2 [2(7) +(25-1)7]
=25/2 [14 +24(7)]
=25/2 [14 + 168]
=25/2 x 182
=25 x 91
=2275 [Ans.]
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Answered by
6
Answer:
Answer:
Formula for finding sum of numbers in A.P = n/2 [2a +(n-1)d] = Sn
First 25 natural numbers divisible by 7 → 7, 14, 21, .... 175
Here,
- a=7
- n=25
- d=14-7= 7
Now ,
Sn = n/2 [2a +(n-1)d]
=25/2 [2(7) +(25-1)7]
=25/2 [14 +24(7)]
=25/2 [14 + 168]
=25/2 x 182
=25 x 91
=2275 [Ans.]
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