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21 , 18 , 15 , ... സമാന്തര ശ്രേണിയിലെ എത്രാമത്തെ പദമാണ് - 81 ?

A34

B35

C37

D36

Answer:

B. 35

Read Explanation:

ആദ്യ പദം (a) = 21

പൊതുവ്യത്യാസം = -3

n -ാം പദമാണ് -81 എങ്കിൽ 

n -ാം പദം കണ്ടെത്താനുള്ള സമവാക്യം = a+(n-1)d

= 21+(n-1) x -3 = -81 

21- 3n+3 = -81

24-3n = -81

3n = 105

n = 35 


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