Question

how many terms are there in the AP? 7,10,13......139

Answer 1

a=7
d= 3
L= 139
a+(n-1)d = 139
=> 7 +(n-1)3 = 139
=> (n-1) *3 = 132
=> n-1 = 44
=> n = 45

No. Of terms = 45

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Answer 2

by using formula
=a+(n-1)d
139=7+(n-1)3
139-7=(n-1)3
132=(n-1)3
132/3=n-1
44=n-1
n=45
where a is first term and d is common difrence