1.

If the nth term in an A.P is 2n+5, then its first term is

Answer»

Step-by-step EXPLANATION:

It is given that, First term, a=−1, Common Difference, d=−3, and Number of TERMS, n=12

∴n

TH

term of any AP is given by:

T

n

=a+(n−1)d

Hence,

T

12

=(−1)+(12−1)(−3)=−34


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