Math, asked by chetanpatel47, 1 year ago

1+4+8+13 sum of n terms

Answers

Answered by horrorhunter

5

first term=1
last term =13
Sn=?
Sn=n/2(a+l)
Sn=n/2(1+13)
Sn=n/2×14
Sn=7n

horrorhunter: Mark it as brainlist

chetanpatel47: ans is not up to the mark

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