First slide

Arithmetic progression

Question

An employee gets Rs.300 per month in his 11th year of service and got Rs.495 per month in his 24th year of service. If his monthly salary is in A.P his initial salary and his increment are

Moderate

A

Rs.200, Rs.10
B

Rs.300, Rs.10
C

Rs.150, Rs.20
D

Rs.150, Rs.15

Solution

$t_{11} = a + 10 d = 300; t_{24} = a + 23 d = 495 \Rightarrow d = 15 \Rightarrow a = 150$

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