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ഒരു സമാന്തരശ്രേണിയിലെ 5-ാം പദം 19, 10-ാം പദം 39 ആയാൽ ആ സംഖ്യാശ്രേണിയിലെആദ്യപദം ഏത്?

A3

B4

C6

D5

Answer:

A. 3

Read Explanation:

5-ാം പദം = 19 =a+4d......(1) 10-ാം പദം = 39 =a+9d.....(2) (2) - (1) 5d = 20 d = 4 a+4d=19 a+16=19 a=3


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