Q. 65.0( 1 Vote )

# How many te

Answer :

(i) Here, first term, a = -1

Last term, l =

__We know that common difference, d = a _{1} – a.__

∴ d = – (-1) = + 1 = =

__We know that Number of terms, n = (____) + 1.__

⇒ n = + 1

= + 1

= + 1

= (13 × 2) + 1

= 26 + 1

= 27

∴ There are 27 terms in the given A.P.

(ii) Here, first term, a = 7

Last term, l = 205

__We know that common difference, d = a _{1} – a.__

∴ d = 13 - 7 = 6

__We know that Number of terms, n = (____) + 1.__

⇒ n = + 1

= + 1

= 33 + 1

= 34

∴ There are 34 terms in the given A.P.

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