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choose the correct choice in the following and justify . 1) 30th term of the AP : 10,7, 4......., is A) 97 B)77 C) -77 D) -87

Posted by Akash Kd 5 years, 6 months ago

CBSE > Class 10 > Mathematics

3 answers

Aryan Mishra 5 years, 6 months ago

30th= ? a=10 n=30 d=a2-a3=7-10= -3 an= a+(n-1)d = 10+(30-1)(-3) = 10+29(-3) = 10-87 = -77 a30= -77

0Thank You

Aryan Mishra 5 years, 6 months ago

30th term=? a=10 n=30 d= a2-a1= 7-10= -3 an=a+(n-1)d = 10+(30-1)(-3) = 10+29(-3) =10-87 = -77 a30= -77

0Thank You

Gaurav Seth 5 years, 6 months ago

C) -77

Given AP = 10,7,4 find 30th term ??

a = 10 n = 30 d = T2-T1 = 7-10 = -3

Tn = a+(n-1)d

⇒ 10+(30-1)-3

⇒ 10+ 29 × (-3)

⇒ 10 - 87 = -77

T30 = -77..

0Thank You

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