exam Maths Puzzle Numerical Ability

what comes next in the sequence.
1,3,7,13

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exam Other Question

ab^6(a^2-2a-15)
_________________ divided by
a^7b^5(5-a)



Thank you so much!!!!!1
Can you please help me solve by using the subtitution and elimination method (unless there is no infnite number or solution.)
x + 2y = 6,
2x + y = 8